Variadic Templates

In C#, variadic templates can be classes with repeated methods or use collection initializers and compile them into series of calls. Q# and C# are used to write quantum programs. Variadic templates help writing C# Drivers.

The code snippet shows Add Call with its own generic parameters and type  inference.

using System;
using System.Collections.Generic;
using System.IO;
using System.Net;


using Microsoft.Quantum.Simulation.Core;
using Microsoft.Quantum.Simulation.Simulators;


namespace Hello
{
    class Driver
    {


        static void Main(string[] args)
        {


            Container listContainer = new Container() {
              () => new List<byte>()


          };
            Container memoryContainer = new Container() {
        () => new MemoryStream()
         };
            Container credentialContainer = new Container() {


              () => new CredentialCache()
             };
            Console.WriteLine(listContainer + "Type " + listContainer.GetType());
            Console.WriteLine(memoryContainer + "Type " + memoryContainer.GetType());
            Console.WriteLine(credentialContainer + "Type " + credentialContainer.GetType());
        }


    }
    class Container : System.Collections.IEnumerable
    {
        public void Add<T>(Func<T> func)
        {


        }


        System.Collections.IEnumerator System.Collections.IEnumerable.GetEnumerator()
        {
            throw new NotSupportedException();
        }
    }




}

Run the following commands  to execute the project in Visual Studio Code:

^F5 

In the terminal, you can execute the build by running the command below.

dotnet run

The screenshot of the output is attached below: